S
M
T
W
T
F
S
26
50°
38°
27
50°
38°
28
42°
31°
29
64°
25°
30
56°
32°
1
60°
27°
2
72°
24°
3
75°
40°
4
72°
37°
5
56°
41°
6
61°
36°
7
72°
32°
8
79°
43°
9
71°
39°
10
74°
31°
11
86°
39°
12
78°
42°
13
82°
36°
14
84°
61°
15
93°
48°
16
87°
46°
17
79°
53°
18
52°
41°
19
62°
37°
20
59°
34°
21
70°
46°
22
70°
47°
23
78°
39°
24
88°
44°
25
93°
61°
26
87°
60°
27
86°
52°
28
77°
62°
29
71°
62°
30
78°
63°
31
81°
59°
1
81°
59°
2
81°
58°
3
82°
58°
4
82°
57°
5
81°
58°
6
85°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Belfast
Belfast's May 2026 forecast shows daily high temperatures ranging from 71° to 85°, with overnight lows between 57° and 63°. The average high for May is 80° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Belfast. See also: June | July | August.
